Alot of times if the camera I'm using only has paid choices, than where you fill in the server IP, I enter nvrdns.com or easterndns.com, or a free
ddns server. If the drop down says dyndns, and dyndns wants you to pay, just choose dyndns and than in the server IP address, enter nvrdns.com. It will go to the server IP address rather than the drop down choice. Also, if you have an NVR, use the NVR to update your IP, not the cameras, as mentioned.